| With the development of high speed machining, the demand of motorized spindle become more and more. The question of motorized spindle gives off heat is the important factor which restricts the motorized spindle develops.This article has carried on the comprehensive analysis to the motorized spindle temperature rise characteristic, through the motorized spindle thermal state finite element analysis to obtain the temperature field distribution in the bad operating mode, found the motorized spindle temperature rise biggest spot as well as the first rear bearing temperature rise characteristic, and carries on the analysis to its reason. Finally it obtains that one of essential examination objects is the motorized spindle axle center temperature.The article uses the infrared temperature measurement method to carry on the examination of the motorized spindle axle center temperature. Through temperature value, motorized spindle rotational speed, running time and so on Obtains temperature rise early warning value H, this value had reflected the temperature rate of change and the maximum temperature affect together the result, merely the way which reports to the police by the temperature upper limit achievement even more has the predictability compared to the tradition, intellectualized. According to early warning value H, establishment temperature forecast models, to forecast and advance warning the temperature rise and the breakdown of motorized spindle, to extend the life of motorized spindle and prevent the bearing burn. It is very important to the safe operation of motorized spindle.At last, the truly effective measures to reduce the heat and thermal deformation of the motorized spindle are brought forward. The measures are the motorized spindle axle center cools and under the bearing collar lubricates. And it carries on the analysis simulation to its cooling effect, which confirmed its accuracy even more. This opened the new mentality for the development of motorized spindle.
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